Week 11 — Readings & Resources

Your primary reading is Chapter 11 (in this module). Everything below is the optional, go-deeper layer — pick what helps, skip the rest.

How to use this page

This page has 11 items (5 readings and 6 videos). Allow 71–83 minutes for everything. Each group points back to the matching chapter section and class-session segment, so use the full menu when you want more, or take the quick path below.

Every video here has captions: turn them on with the CC button in the player. The chapter covers the same ideas in text.

Pick-one quick path (18–20 min total)

• A Beginner's Guide to Punnett Squares — Bozeman Science
• Is a dominant version of a trait always more common than the recessive one? — The Tech Interactive
• Test Crosses — sci-ology

① Dominant, recessive, and what dominance does not mean

Chapter 11, Section “Cure the dominant-means-common myth” · Session 1, Segment 2, “Dominant does not mean common” · Remember: dominant means an allele shows when it is present, not that it is common or strong.

• Is a dominant version of a trait always more common than the recessive one? — The Tech Interactive — a science museum's ask-a-geneticist answer that pulls apart the two questions this week keeps separate: which version shows in one person, and how common a version is in a population; notice the examples of a recessive version that is common and a dominant one that is rare. Use it while working through the Week-11 module overview. (reading, 3–5 min)
• Some genes are dominant — DNA from the Beginning — a short concept page, with an animation tab, on why a hybrid pea plant shows only one seed color and how the hidden color comes back in the next generation; read the concept text and watch the animation, then say in your own words which allele is hiding. (reading, 3–5 min)

② Mendel, segregation, and the Punnett square

Chapter 11, Section “Fill a Punnett square” · Session 1, Segment 5, “The Punnett square” · Remember: fill all four boxes first, then count; genotypes come out 1:2:1 and phenotypes 3:1.

• Heredity: Crash Course Biology #9 — CrashCourse — a fast, joking episode on Mendel, alleles, and the Punnett square; it also wanders into traits more complicated than this week's one-gene model, so hold on to the vocabulary and the square and let the extras go by. (video, 10 min) (captions: creator)
• The Man Who Discovered Dominant & Recessive Genes: Meet Gregor Mendel — SciShow — the story of Mendel and his pea crosses, told as a short biography; it carries more history than this course tests, so listen for how he counted offspring and where the 3-to-1 pattern came from. (video, 11 min) (captions: creator)
• Genetic inheritance follows rules — DNA from the Beginning — a concept page on why each egg or sperm carries only one gene of each pair and how a cross of two hybrids gives three of one seed color for every one of the other; this builds on Week 9's work with how cells divide and hand on their chromosomes. (reading, 3–5 min)
• A Beginner's Guide to Punnett Squares — Bozeman Science — a steady walk through setting up and filling the grid, with several one-gene examples and one two-gene example at the end; pause before each grid is filled and fill it yourself first. (video, 12 min) (captions: creator)

③ Odds, not promises, and the test cross

Chapter 11, Section “Use the product rule and the sum rule” · Session 2, Segment 6, “The product rule and the sum rule” · Remember: multiply for and, add for or, and read a ratio as odds over many offspring.

• Probability in Genetics: Multiplication and Addition Rules — Bozeman Science — a worked walk-through of the two rules this week names the product rule and the sum rule, using coins, dice, and crosses; as you watch, say which rule each question needs before the answer appears. (video, 11 min) (captions: creator)
• Test Crosses — sci-ology — a short video on crossing an unknown dominant-looking organism with a homozygous recessive one to read its genotype from the offspring; check its two outcomes against the chapter's all-dominant and 1:1 results. (video, 3 min) (captions: creator)

④ Two genes at once

Chapter 11, Section “Add a second gene: independent assortment and the dihybrid cross” · Session 2, Segment 8, “Two genes: the dihybrid cross” · Remember: four gamete types per parent give 16 boxes, and the product rule reaches 9:3:3:1 faster.

• Dihybrid Crosses & The Rule of Multiplication — HeyNowScience — a short video that works a two-gene cross both ways, with the 16-box grid and with multiplication; compare its shortcut with the chapter's 9⁄16, 3⁄16, and 1⁄16. (video, 4 min) (captions: automatic)
• Dihybrid Cross Problem Set — The Biology Project — a set of short multiple-choice problems on two-gene crosses, each with a brief explanation, from listing the gametes of a double heterozygote to the 9:3:3:1 ratio; work the first several problems and skip the last one on exceptions, which reaches past this week. (reading, 10–15 min)

Optional one-stop reference (free online reference)

• Mendelian Inheritance — National Human Genome Research Institute Talking Glossary — the course's free glossary of genetic terms, open at its entry on Mendelian inheritance; read the short definition, and treat the narration's lab story as optional color. (reading, 1–2 min)

Heads-up (links rot): these point to outside sites that occasionally move or rename pages. If a link ever fails, tell your instructor and use the reference above in the meantime.

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